Jackson has an over-bite. I call him my bucktooth boy, hehe. It's not noticeable unless you are like laying under him looking that way. His top jaw is a bit longer than the bottom. In his case, bad breeding! The vet was the one that noticed, I never did, at his 12 week appt. The only thing I may have to worry about in the future is his bottom canines stick into his top gums a bit and the vet said they could definitely start bothering him and leaving a mark in his top gums. So we may have to shave them down so they're not as sharp. Other than that, he eats perfectly normal, etc. You can kinda see it in this puppy pic...